<div class="card">HOVER</div>
<style>
/* From Uiverse.io by eslam-hany - Tags: card */
.card {
  position: relative;
  width: 220px;
  height: 320px;
  background: mediumturquoise;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 25px;
  font-weight: bold;
  border-radius: 15px;
  cursor: pointer;
}

.card::before,
.card::after {
  position: absolute;
  content: "";
  width: 20%;
  height: 20%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 25px;
  font-weight: bold;
  background-color: lightblue;
  transition: all 0.5s;
}

.card::before {
  top: 0;
  right: 0;
  border-radius: 0 15px 0 100%;
}

.card::after {
  bottom: 0;
  left: 0;
  border-radius: 0 100%  0 15px;
}

.card:hover::before,
.card:hover:after {
  width: 100%;
  height: 100%;
  border-radius: 15px;
  transition: all 0.5s;
}

.card:hover:after {
  content: "HELLO";
}
</style>
